Computing device.



A. C. SARGENT.

COMPUTING DEVICE.

APPLICATION FILED 05c. 19. 1914.

Patented Aug. 17, 1915.

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UNITED STATES PATENT OFFICE.

ALLAN C. SARGENT, OF WESTFORD, MASSACHUSETTS, ASSIGNOR TO G. SARGENTS SONS CORPORATION, OF GRANI'IEVILLE, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

COMPUTING DEVICE.

To all whom it may concern:

Be it known that I, ALLAN C. SARGENT, a

citizen of the United States, residing at VVestford, in the county of MiddleseX and State of Massachusetts, have invented a new and useful Computing Device, of which the following is a specification.

This invention relates to a computing de-.

use of my invention the result may be obtained by inspection without laborious arithmetical calculations. The result in this class of computations has a certain pecullar proportional relation to the selected number which represents thecost of the raw stock, as the cost of the finished stock increases with the percentage of shrinkage.

It will be obvious, however. that my device may be used for other classes of computations and that the proportional relation may be either direct or inverse.

It is the object of my invention to provide an improved computing device by which computations of the character described may be quickly and easily performed with out arithmetical ,calculation.

-To the attainment of this object, my invention consists in certain devices, arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention, together with a modification thereof, is shown in the drawings in which- 7 Figure 1 is a face view of the preferred form; Fig. 2 is a face view of the lower or rear disk in the preferred form; Fig. 3 is a partial face view of a modification, and Fig. 4 is a partial face view of the lower disk shown in Fig. 3.

Referring to Figs. 1 and 2, my improved computing device in its preferred form com- 1prises an upper disk A and a lower disk B,

oth mounted upon a pivot C and relatively movable with reference to each other. The disk A is provided with an opening D and,

Specification of Letters Patent.

is also provided with a series of graduations E ad ac ent a portion of the edge of the disk. The graduations E are numbered to indicate the percentage of shrinkage of stock and the graduations gradually increase in length as the percentage numerals increase. The disk A may also be provided with a radial slot F having its outer end narrowed to 'a point as shown in Fig. 1.

The lower disk B is provided with a series of figures G which may represent the cost of the raw stock in cents per pound. These figures are concentrically arranged with reference to the pivot C and the space between successive adjacent figures decreases as the numerical value .of the figures increases. The central portion of the disk B may also be provided with radial graduations H corresponding in position to the numbers G.

The numbers G are so spaced from the center that when the disks are assembled these numbers appear successively throu h the opening D in the disk A as the dis s are relatively rotated. At the same time the graduations H become visible through the slot F and permit more accurate setting of the disks.

The lower disk B is of greater diameter than the disk A and is provided around its outer edge with a series of numbered graduations K which are designed to indicate the cost of the clean stock. The length of the graduations K gradually decreases as the numbers designating the graduations increase.

It should be noted that the three sets of numbers or graduations E, G and K, in-

crease in numerical value in the same direction, which as shown in the drawlngs 1s counterclockwise. Precisely simllar results could be obtained by reversing the direction necessary to set the disks so that the number representing the cost of the raw stock shall appear in the opening D. (As shown in Fig. 1, this number is 16). It is then Patented Aug. 17, 1915.

Application filed December 19, 1914. Serial No. 878,030.

representing the actual percentage ,of

shrinkage for the stock in question and to thereafter read the graduation K corresponding to the shrinkage selected.

Referring to'Fig. 1, if the raw stock costs 16 and. the shrinkage is 50%, the cost of the clean stock would be 32. If the shrinkage is,60%, the cost of the finished stock would be 40; and if the shrinkage is 75%, the cost of the finished stock would be 64. It will thus appear that the cost of the finished stock for any percentage of shrinkage can be instantly obtained by inspection after the disks are set to show the cost of the raw stock through the opening D.

In the modified form shown in Figs. 3 and 4 I have provided a circumferential slot L in the disk A and have substituted graduations KandK on the disk B in place of the graduations K shown in Fig. 2, the graduations K appearing through the slot L. I number every fifth graduation of the series K and number the intermediate graduations of the series K, this arrangement permitting the legible numbering of all of the graduations upon the lower disk B.

The use and operation of the modified form of the device is identical with that previously described.

Having thus described my invention it will be evident that other changes and modifications can be made therein without departing from the spirit and. scope of my invention as set forth in the claims, and I do not wish to be otherwise limited to the de-.

tails herein disclosed, but

What I- claim is: a

1. A computing device having, in combination, a pair of relatively rotatable disks, the upper disk having an opening therein and having a set of numbered graduations adjacent a portion of the edge thereof, the

length of said graduations progressively increasing as the numbers increase, the lower disk being of greater diameter than the upper disk and having a set of figures concentrically arranged to appear successively through said opening and also having a set of numbered graduations adjacent a portion of the edge of said disk, the space between adjacent figures and between adjacent graduations progressively decreasing as the numbers increase, and all of the sets of fi ures and graduations increasing numerical y in the same direction, the several sets of numbers and figures being so selected and disposed that graduations on the lower disk may be selected having definite proportional relations to the figure appearlng through the opening in the upper disk.

'2. In a computing device, a pair of relatively rotatable disks, each having a set of numbered graduations along its edge, said upper disk having a slot concentric with the axis of said disk and extending partially around the disk, a part of each graduation on the lower disk appearing through said slot, and another part appearing beyond the edge of the upper disk, certain of said graduations being numbered beneath the slot and the intermediate gradu ations being numbered along the edge of the lower disk.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

ALLAN C. SARGENT.

Witnesses:

JAMES M. SARGENT, FRED W. SWAIN. 

